Major Jurisdictions no Longer Subject to Income Tax Examinations by Tax Authorities (Detail)	9 Months Ended
	Sep. 30, 2012
U.S. federal
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2008 and prior
California (United States)
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2006 and prior
Canada
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2007 and prior
Japan
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2007 and prior
South Korea
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2008 and prior
United Kingdom
Income Tax Examination [Line Items]
Years No Longer Subject to Audit	2007 and prior